title: Well-controlled ring-opening polymerization of cyclic esters initiated by dialkylaluminum β-diketiminates.
abstract: A series of aluminum alkyl complexes nacnacRAlMe2 (2a-2h) bearing aliphatic N-substituted β-diketiminate ligands (nacnacRH = N,N'-dialkyl-2-amino-4-iminopent-2-enes), were prepared from the reaction of trialkyl aluminum and the corresponding β-diketimines. All these aluminum complexes were characterized by NMR, elemental analysis and HRMS spectroscopy. The molecular structures of complexes 2a, 2c and 2h were confirmed by single-crystal X-ray diffraction. These aluminum alkyl complexes show notable activity towards the ring-opening polymerization of ε-caprolactone in the absence and presence of alcohol, and the resulting polymers have narrow molecular weight distributions.
authors.affiliation: State Key Laboratory of Fine Chemicals, School of Pharmaceutical Science and Technology, Dalian University of Technology, Dalian 116024, PR China.
authors.forename: Di
authors.initials: D
authors.lastname: Li
authors.forename: Ying
authors.initials: Y
authors.lastname: Peng
authors.forename: Chao
authors.initials: C
authors.lastname: Geng
authors.forename: Kaipeng
authors.initials: K
authors.lastname: Liu
authors.forename: Dexu
authors.initials: D
authors.lastname: Kong
mesh_terms: D000438:Alcohols / Q000737:chemistry; D000535:Aluminum / Q000737:chemistry*; D002208:Caproates / Q000737:chemistry; D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry; D018360:Crystallography, X-Ray; D004952:Esters; D007097:Imines / Q000737:chemistry*; D007783:Lactones / Q000737:chemistry; D008024:Ligands; D008968:Molecular Conformation; D058105:Polymerization
chemical_list: D000438:Alcohols; D002208:Caproates; D056831:Coordination Complexes; D004952:Esters; D007097:Imines; D007783:Lactones; D008024:Ligands; C121056:caprolactone; D000535:Aluminum